Rubber ring or band and method for making the same



Jan. 19, 1932. J. R. GAMMETER RUBBER RING OR BAND AND METHOD FOR MAKING THE SAME Filed March 20, 1928 feather-edged ends;

Patentedv Jan. l9, 1932 a UNITEDSTAFTTES' mm n. GAMMETER, AKRON,

RUBBER RING on BAND AND matriarc -res gn ng 1 Application filed March 2o,1928.";Serir" 'No'. 2 3,075.

This invention relates to rings or bandsof rubber or the 'likeand procedure for maln'ng the same. v a v The general purpose of the present invention is to provide a rubber or like ring or band having a substantially uniform crosssection and smooth exterior surface and free from splices, lumps or knots, and also simple and inexpensive procedure for making thesame. 7

More particularly, the invention has'for its objects the provision of a ring or band ofrubber or the like consisting of a tube of rubber or the like formed with ends gradually tapering to a feather-edge and rolledupon itself to form a ring and the provision of a method for makingsaid ring'comprising' the steps of forming the tube such as described above, rolling it upon itself to form the ring and curing or vulcanizing the ring.

The foregoing and other objects of the invention are attained bythe ring or band construction and the method illustrated in the accompanying drawings and described below.

It is to be understood'thatl the invention is for practicing the invention comprises pouring or spraying a dispersion of rubber, such as natural or' artificial latices, upon the surface of a rotary drum, preferably heated, to dry or coagulate the latex, the rubber flowing in both directions from the point of'pouring or spraying on the surface of the drum, whereby tapered, feather-edged ends are formed on the resulting tube. 7

- This'method is illustrated in Figure 1, the

numeral 10 designating a suitable drum mounted on a arrangedl toibe rot'ated' in any suitable way, a cranklQ-"being shown for this purpose. A thickenedor con;

centrated; rubber dispersion; 13: tori 1 solution preferably containingjthe usual vulcanizing ingredients to roduce, strength and elastic-' OHIO, AssIeNon 4 fro memo rRo fess;11mindoor; IPORATION OF OHIO, r

ity maybepoured onto drum 10:from a suite j ableyessejl "14; :jA drip, pan 15 maybe-pro} .vide'd beneath drum-10.'-?,By thisprocedure,

a tube of rubber is obtainedondrum 10, the ends of: which tube are tapered as indicated The next step in the :method consi ts in rolling-'thegtube of raw or unvulcanized rubber-upon. itself from one end; to-the'other. This may be done by harnl or,v by any, iof the various Jbead rolling I QV Q mpl in :the manufa'ctureofidippedrHb l.'g

is illustrated in Figure 2. As a;r esult; of this;;step"-of the method, a

and being uniform throughout and the 1 .cx-

terior surface thereof being; substantially S QQB H he Yit m y b u c ni y d -r rect application of a curingimedium thereto withoutthe use of molds. *1 1 a a a The preferred method-pfwvulcanizing thev rings 0 ba ds 75 fs=to i mmers -t s hot water as shown in Figure 4; 'The rings'may' be mounted; on a ,drum 18 I and. immersed in the hot water in a vessel19 having a supply nsg ib d 7 firub er ss cur d'i's hv I is illustratedjin Figure 3 the cross-section of 3 the ring being substantially a perfect circle connection 20and drain; 21 Acoyer 22 may be provided forvesselj19.to seal it for the application of desired. r a

The resulting rubber bands. will be of round, uniform cross-section, having a smooth exterior surface and will be free from splices, knots or lumps. Because of the unias pressure upon the water, if

formity of the band,'it will stretch uniformly throughout its circumference and'because of 1 its round cross-section, it maybe rolled onto an object'without twisting.

By curing or vulcanizing the rubber while itJis on a circular form, either the'drum 1. I i upon whichit is rolled, oron a separate curing drum, the circular condition of the rings is preserved. The elasticlty and life ofthe I5 if i rings is also increased as the tendency of the rings to shrink upon curing is resisted by the drum. n

It will be apparent that by the invention, a greatly improved rubber band and a greatly improved procedure for making such bands has been devised.- Obviously,-modifications of this invention may be resorted to without departing from the spiritthereof or the scope of the appended claims. i

What is claimed is 1. That method for making rubber rings or bands which comprises pouring a concentrated rubber dispersion n a rotating hot drum to form a tube of rubber with tapered feather edges, rolling saidtube upon itself from one end to the other to form an endless ring or band, and vulcanizing 'sa-id' band underwater at a curing temperature and pressure.

= 2.-That-method for'making rubber rings or'bands which comprises pouring rubber in liquid form on a rotating drum to form a tube of rubber with tapered feather-edges,

rolling said tube upon itself from one end to the other to form an endless ring or band, and vulcanizing said band under water at a curing temperature.

3; That method of making a rubber band comprising applying rubber in liquid form to; a rotating drunrto form a tube with tapered ends, rolling said tube upon itself to form an endless ring, and vulcanizing said ring.

4, That method of making a rubber band comprising forming a tube of, unvulcanized rubber with tapered ends, rolling said tube of rubber upon itself to form an endless ring, and vulcanizing said ring.

5. That method of makinga rubber band comprising forming a thin tube of unvulcanized' rubber with ends tapered to featheredges, rolling said tube upon itself to form a ring, and vulcanizing said ring.

6. That methodof making endless rubber rings, which comprises depositing rubber from a liquid ontoa drum to forma tube open at both'ends, and rolling said tube upon itself from one end to the other. 3 V JOHN R. GAMMETER. 

